Method for monitoring foul and damp degree on surface of insulator

An insulator and pollution technology, applied in the field of on-line monitoring of transmission line insulators, can solve the problems of high price, large storage capacity, large error, etc., to achieve the effect of good dampness and avoid leakage current

Active Publication Date: 2014-04-16
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] At present, the main methods for monitoring the degree of pollution and moisture on the surface of insulators are: image processing method, using computer processing to take pictures of the degree of pollution and moisture on the surface of insulators through cameras, this method has relatively large errors; Low-frequency signal, microwave signal, ultrasonic signal) method, this method requires high-precision sensors when obtaining low-frequency signals, the price is expensive, and the characteristic signal is not obtained sufficiently, the error is large; the method of monitoring the leakage current flowing through the dirty surface of the insulator, this This method requires a large storage capacity and is difficult to analyze

Method used

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  • Method for monitoring foul and damp degree on surface of insulator
  • Method for monitoring foul and damp degree on surface of insulator
  • Method for monitoring foul and damp degree on surface of insulator

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Embodiment

[0027] like figure 2 As shown, a method for monitoring the degree of pollution and moisture on the surface of an insulator includes the following steps:

[0028] S1 Arrange the electrodes on the surface of the insulator, and connect the arranged electrodes as figure 1 In the measurement circuit shown, the measurement circuit is composed of a power supply Us, a fixed value resistance Rs, a fixed value capacitor Cs, and an equivalent resistance Rx of contamination on the surface of the insulator, wherein the fixed value capacitor and the equivalent resistance of the contamination on the surface of the insulator are connected in parallel and sequentially Connect with fixed value resistor and power supply, Ux in the figure represents the voltage of the equivalent resistance Rx of insulator surface pollution.

[0029] like figure 1 For the circuit shown, the total impedance in the circuit can be obtained:

[0030] Z = R s ...

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Abstract

The invention discloses a method for monitoring foul and damp degree on the surface of an insulator, which comprises the following steps: S1, in a measuring circuit, collecting the voltage signals of a fixed resistor and a power supply; S2, subtracting the initial phase angles of the two voltage signals, and taking the absolute value of the difference value to obtain phase angle difference theta; S3, obtaining the relational expression between the phase angle difference theta and the equivalent resistance Rx of foulness on the surface of the insulator; S4, according to the change of the phase angle difference, obtaining the foul and damp degree on the surface of the insulator. According to the invention, the measurement error is less, the equipment is cheap , and the analysis of the monitoring result is simple.

Description

technical field [0001] The invention relates to the field of on-line monitoring of transmission line insulators, in particular to a method for monitoring the degree of pollution and moisture on the surface of an insulator. Background technique [0002] For a long time, the surface of insulators on transmission lines has been polluted and damp, and pollution flashovers and lightning tripping accidents have occurred from time to time, causing heavy losses to the national economy. According to statistics, the number of insulation flashover accidents caused by pollution occupies the second place in the total number of accidents in the current power grid, second only to lightning accidents, but the loss caused by pollution flashover accidents is 10 times that of lightning accidents. Therefore, pollution flashover accidents have become a serious threat to the safe operation of power grids. Knowing the degree of pollution and moisture on the surface of insulators in time plays an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 阳林钟荣富郝艳捧李立浧
Owner SOUTH CHINA UNIV OF TECH
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